Which type of animals were the Dinosaurs having feathers?

$A$ trait in an organism is influenced by

Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.

What is the probability percentage of a zygote developing into a male or female offspring in humans?

Study the following cross and the self-pollination in $F_1$. Fill in the blank and answer the question that follows:
Parents: $RRYY \times rryy$
(Round,yellow) (Wrinkled,green)
$F_1$: $RrYy \times$ ?
(Round,yellow)
What are the combinations of characters in the $F_2$ progeny? What are their ratios?

$(a)$ Explain why the wing of a bat and the wing of a bird are considered to be analogous organs.
$(b)$ List two factors that lead to the formation of a new species.